Oregon has a large number of volcanoes in addition to
the major
volcanoes of the Cascade
Mountains. The volcanoes in the following
view were mapped using a volcano
icon from a list
of icons provided
with Google Earth.

This
map includes both uneroded and eroded volcanic features.
Oregon probably
has had
even greater numbers of volcanoes in the
past but many have simply been eroded
away or
covered by later
deposits.

Oregon volcanoes

The northern grouping of Oregon volcanoes follows the
main line of the Cascade mountains.

a closer view of the northern portion of the distribution of volcanoes in Oregon

The southern grouping of Oregon volcanoes
follows the main line of the Cascade mountains.

a closer view of the southern portion of the distribution of volcanoes in Oregon

a close view of the central portion of the distribution of volcanoes in Oregon

Circular features in Oregon were also mapped using the measuring
tool that
accompanies Google Earth.
The line segments in this view
were given a green color. The source of
these circular patterns is still
not
fully explained at present but is probably due to igneous and
tectonic activity.

The feature
indicated by "Indian"
is an archaeological site with
large pictographs.

distribution of circular features in Oregon

Different types of features can easily be included on
the same
Google Earth view. The features are all
stored on kml files and
can added to or be depleted. Many circles are
found along the
Cascade Mountains
line along with the volcanoes. The large
number of circulaR features in the
northeastern section does not
correlate with volcanoes but is an area of abundant hot springs.

volcanoes and circular features in Oregon

In the following view, North is to the right. The map was turned
sideways
to better fit the diagonal
shape of the view. Only the
major volcanoes of the Cascades are marked
with icons. The small
circular
features, most which are actually small volcanoes, closely
follow the main line
of the Cascade Mountains.

volcanoes and circular features along the Cascade Mountains

Extensive mapping of both linear features and drainage patterns
was done for
most of Oregon. Heavy vegetation cover East of the
Cascades Mountains prevent the mapping of
features in this area.
Thousands of lines were used to create this map. The significance
of the
project can only be appreciated
by zooming in closer on
specific areas.

linears and drainage patterns in Oregon

Three large circular features stand out in the following view.
The
circles were determined primarily by
alignment of linear
features and by the termination of linear features.
The largest
two circular features
have diameters of 28 kilometers and 26
kilometers.

a close view of linear and circular features

Here is another view of large circular features indicated by
linears structures.
The diameters of the
three largest circles
are 53 kilometers, 35 kilometers, and 34 kilometers.

a close view of linear and
circular features

Again, various types of features can be combined in a single
map: linear
features, circles and volcanoes.
Together, these
features nicely identify a large double ring structure.

a close view with linears,
circles and volcanoes

An additional feature that can be added to these maps is color.
Most of
eastern Oregon is a dull gray
color. Occasionally there
are brightly colored patches of red, orange, and
yellow iron oxides
produced by
the oxidation of iron minerals. In the southeast corner
of Oregon there is
a large circular feature that
extends into
surrounding states. This double-ringed circular features is
nicely
marked by colored patches
of iron oxides. Also in this view are two
smaller circular features
emphasized by strongly colored patches
of iron oxides.

view of the southeast corner of Oregon

The following shows the distribution of hot springs in Oregon.

hot springs

By combing both hot spings
and volcanoes, one can areas of both correlation and no correlation.

volcanoes and hot springs

While searching for circular patterns in Oregon, I came across
several strange
spiral patterns. This
view contains just two of the
features. Research confirmed that these are
archaeological artifacts
that
have not been dated, very large pictographs. The area is next
to Fluke lake
where there are many much
smaller carvings of a
similar pattern on rocks. The size of these features
is impressive.